题目内容

选区出正确的答案。

I'm sorry to have kept you ________(to wait, waiting, wait)for such a long time．

答案：waiting
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相关题目

选区出正确的答案。

He is not old enough ________(to go, go, going)to school．

选区出正确的答案。

The man admitted ________(rob, to rob, robbing)the bank．

选区出正确的答案。

People must stop ________(to cut, cutting, cut)down trees．

选区出正确的答案。

I'd rather ________(to have, having, have)a cup of coffee．

选区出正确的答案。

Mike managed ________(to give, giving, give)up ________(to smoke, smoking, smoke)．

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